<!DOCTYPE html>
<html>
<head>
  <meta charset=utf-8 />
  <style>
      iframe{ width: 706px; height: 650px; margin-top:-190px; margin-left:-120px;
      }
  </style>
</head>

<body>
  <iframe id="a" frameborder="0">
  </iframe>
  <script>
  var word = location.href.slice(location.href.indexOf('?a')+3);
  document.getElementById('a').setAttribute(
      'src',
      'https://www.bing.com/dict/search?q=' + word);
  </script>
</body>
</html>
